study stuff for exams term 2 summary Flashcards
What do all physical quantities consist of
all physical quantities consist of a numerical magnitude and a unit
what are the five SI base quantities and their units
recall the following SI base quantities and their units: mass (kg), length (m), time (s), current (A), temperature (K)
prefixes and their symbols to indicate decimal submultiples or multiples of both base and derived units:
(Include multiplication factor)
pico (p) x 10 - 12 nano (n) x 10-9 micro (μ) x 10 - 6 milli (m) x 10 - 3 centi (c)x 10 -2 deci (d) x 10 - 1 kilo (k) x 10 3 mega (M) x 10 6 giga (G) x 10 9 tera (T) x 10 12
Difference between
Accuracy refers to how close a measurement is to the true or accepted value. Precision refers to how close measurements of the same item are to each other.
scalars vs vectors
Scalars are quantities that are fully described by a magnitude (or numerical value) alone. Vectors are quantities that are fully described by both a magnitude and a direction.
Scalar examples
volume, density, speed, energy, mass, and time.
Vector examples
velocity, momentum, force, and weight
define distance
Distance is defined to be the magnitude or size of displacement between two positions.
Define displacement
Displacement is a vector quantity that refers to how far out of place an object is
Define speed
Speed is a scalar quantity that refers to “how fast an object is moving.”
define velocity
Velocity is a vector quantity that refers to “the rate at which an object changes its position.”
Define acceleration
Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity
describe and explain motion due to a uniform velocity in one direction and a uniform acceleration in a perpendicular direction
MOTION DUE TO CONSTANT VELOCITY IN ONE DIRECTION AND. A CONSTANT ACCELERATION IN A PERPENDICULAR DIRECTION. The motion of objects projected at an angle or horizontally from some height above the ground is called PROJECTILE MOTION.
What is mass the property of
mass is the property of an object that resists change in motion
f =
F = ma
acceleration and resultant force are always in the same direction
What is linear momentum the product of
linear momentum is the product of mass and velocity
what is force
force is the rate of change of momentum
What is weight
weight is the effect of a gravitational field on a mass a
The weight of an object is equal to the product of its mass and the acceleration of free fall
What increases as speed increases
drag force increases as speed increases
terminal velocity
objects moving against a resistive force may reach a terminal (constant) velocity
the principle of conservation of momentum
conservation of momentum, general law of physics according to which the quantity called momentum that characterizes motion never changes in an isolated collection of objects; that is, the total momentum of a system remains constant.
For a perfectly elastic collision what is the relative speed of approach
For a perfectly elastic collision, the relative speed of approach is equal to the relative speed of separation
will kinetic energy take place in interactions between objects
while momentum of a system is always conserved in interactions between objects, some change in kinetic energy may take place
What may the weight of an object be taken as
understand that the weight of an object may be taken as acting at a single point known as its centre of gravity
